tugqlbind

type Binding struct {
	// URL is the source opened; it never leaves the process.
	URL string
	// Ref is the datatug:// reference of a project source, written in full, or
	// nil for a source with no registered project. It is the only form of the
	// source a result records.
	Ref *dbcopy.DatatugRef
	// ProjectDir, Env and Catalog name the project source whose labels apply;
	// ProjectDir is "" for a source no label names.
	ProjectDir string
	Env        string
	Catalog    string
}

type Error string

type Resolver struct {
	// ProjectID is the registered id of the query's project, "" when it has none.
	ProjectID string
	// ProjectDir is the query's project directory.
	ProjectDir string
	// Environment is the run's environment. It is called only when the query
	// binds a database.
	Environment func(ctx context.Context) (string, error)
	// Local resolves a name of a source of the query's own project in env to
	// the source's URL and its catalog id: the one name its sensitivity labels
	// use, whichever of the source's names the query wrote.
	Local func(ctx context.Context, env, name string) (url, catalog string, err error)
	// Foreign binds a datatug:// target that names another project. Nil
	// refuses one.
	Foreign func(ctx context.Context, target string) (Binding, error)
}